Sound absorption index: pass the GBJ75-1984, GB/T19889.3-2005 test. Average acoustic quantity 37dB(A)~43 dB(A).

Noise absorptivity :pass  GB/T20407-2006 test. Average 0.90~0.98

Weather-shield durability : qualified according to JG149-2003, JGJ 144-2004 standard inspection

Fire resistance: achieve A level according to GB/T8626-2006 standard

Impact resistance: according to the A of GB/T14153

Antitypy: pass the GB/T15227

Transmission of light: pass the GB/T2410

Corrosion resistance: pass the GB/T1771-2007

Features: Waterproof and dustproof, beautiful economy, advanced structure, update convenient